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Cold Rolled Steel (CR) Strips / Coils

With the growing demand of cold rolled strips and sheets, Swastik Pipes Limited has started manufacturing CR coils and strips in year 2003 with annual capacity of 1 lac MT / annum in various sizes and thickness.

On line stringent quality checks ensure the tolerances and dimension for sophisticated applications

CR production plant consists of two 4 HI and one 6 HI cold rolling mills along with bell furnaces, Skin Pass, Slitting, cut to length and testing facilities.

Products Range
  • CRCA strips with low carbon
  • Medium carbon steel
  • High strength low alloy steel
  • Semi processed unalloyed electrical
  • Hot rolled oiled & picketed steel
 
           
    CR Strips   Mild Steel in Drawing, Deep Drawing, Extra Deep Drawing Grades Medium and High carbon, SAE 1020, If Steel, High Tensile Steel ( SPC-370-440)  
    Specifications   IS 513, BS 1449, JIS G3141, DIN1623, IS 7226 and equivalent. SPCC, SPCD,SPCE  
    Strip Width   12mm to 1250mm  
    Strip Thickness   0.3mm to 3.2mm  
    Coil Weight   2-17 Kg/mm width  
    Coils Diameter   Internal 400mm & 500mm External 1700mm (max)  
    Cut to Length Sheets   Length 350mm to 3000mm Width 40mm to 1250mm Thickness 0.40mm to 3.2mm  
    Surface Finish   Bright suitable for most purpose & recommended for electro plating with light  
        Mat- Surface is suitable for deep drawing and for painting. Bright Finish, Dull finish, matt Finish  
    CR
Surface Finish
Bright / Polished
Mat Finished 		  Most of the applications are covered with this Surface roughness to have trouble free
deep drawing and lacquering operations.		  
           
  • Semi processed unalloyed electrical
  • Hot rolled oiled & picketed steel
 
MANUFACTURING PROCESS
The manufacturing processes utilizes the latest technology for producing high quality cold Rolled steel coils and sheets. H.R. Coils are procurred from integrated steel plants e.g. SAIL, TATA, and ISPAT etc to ensure the desired raw material standard to meet stringent quality.
 
H.R. SLITTER

The pull through H.R. Slitting line slits the rough edges of the H.R. Coils
 
Pickling
In Semi continuous line surface ferrous scale of H.R. Coils is removed with the usage of warm Hydrochloric Acid. Coil is subsequently rinsed with cold and hot water. The access water on the strips is dried at hot air blower.
 
Cold Rolling
6 Hi Rolling Mill (wider) - One
4 Hi Rolling Mill (narrow) - Two
The Pickled H.R. Coils are cold rolled to required thickness in several passes.
Mills are equipped with all facilities to ensure -- Closure dimensional.
Tolerances, shape and size .
 
Annealing
To attain required properties for formability, cold rolled coils are annealed in protective (non-oxidizing) nitrogen atmosphere. Furnaces are equipped with all required auto controls
 
Skin Passing
Skin passing of cold rolled steel coils is carried out to .
> remove stretcher strain
> obtain desired finish such as mat or bright
achieve flatness
 
CR Slitters
By the precision slitting machines coils are slit to the required width / to cater to the diversified need of customers.
 
Cut to Length
Coils are cut into sheets as per customer requirements.
 
Oiling
The coils and sheets are provided with a uniform coating of rust preventive oil to protect surface from rusting, atmospheric corrosion. This also facilitates storage for long duration.
 
Packing
The coils / sheets are first covered by Polyethene sheet. These are covered by Hessian and sheet metal packaging as per customers requirement. These are tied with steel straps to avoid any damage in handling, transportation and storage.
 
   
 
APPLICATIONS & SPECIFICATION
Customized Cold Rolled Steel sheets and strips are used for the follows applications:-
> A.C. & Refrigerator industry
> Washing Machine
> Electrical Parts
> Electronic Parts
> Automobile Industry
> Steel Furniture Industry
> Fabrication & Engineering
 
 
COLD ROLLED CLOSED ANNELED
 
 
International Standards
Grade   Specifications   -   -   -   -   -
-   15513   JIS G3141   BS1449   DIN 1623   ASTM*   EN 10130
Drawing Quality   D   SPCD   CR3   St.12.13   CQ   FEP03
Deep Drawing Quality   DD   SPCE   CR2   St 14   DQ   FEP03
Extra Deep Drawing Quality   EDD   SPCEN   CR1   -   EDDQ   FEP04
Extra Deep Drawing Quality   -   -   -   -   -   FEP05
Super Extra Deep Drawing Quality (If Grade   -   -   -   -   -   FEP06
High tensile grades available as per customers Specification on mutual agreement ASTM = A366/A366M /A619/ A619WA620/A620M
 
 
 
Designation   Elongation%,
Min.Thickness range (mm)
Tensile Strength 		  -   Test Piece
-   -   0.40 to 0.60
excl 		  0.60 to1.0
excl		   1.0 to1.6excl   -
SPCC   (34)   (36)   (37)   (38)   No.5 in
SPCD   (36)   (38)   (39)   40   Rolling
SPCE   18   40   41   42   Direction
 
  Note:
1. The tensile test value does not usually apply to SPCC
2. For those less then 0.60mm in thickness the tens on test shall generally be omitted		  
 
 
Designation   Erichsen Values for Thickness (mm)
-   0.4   0.5   0.6   0.7   0.8   0.9   1.0   1.2   1.4   1.6
SPCC   7.2   7.8   8.4   8.8   9.1   9.4   9.6   10.0   10.3   10.5
SPCD   7.6   8.2   8.8   9.2   9.5   9.8   10.0   10.4   10.7   10.9
SPCE   8.0   8.6   9.2   9.6   9.9   10.2   10.4   10.8   11.1   11.3
 
  Note:
1. For the intermediate nominal thickness of 0.4mm or more and 1.6mm or less which are not listed in this table, the value shall be obtained by the method of interposition and rounded off at one place of decimal.		  
 
Shall apply to the average of the values of 3 pieces.
 
 
Thickness
Tolerance 		  Width under
600 		  630 to 1,000
excl. 		  1,000 to 1,250
excl 		  1,250 to 1,600
excl.		   1,600 to and
over
Thickness
                   
0.30 to 0.40 excl.
  ± 0.04   ± 0.04   ± 0.04   -   -
0.40 to 0.60 excl.
  ± 0.05   ± 0.05   ± 0.05   ± 0.06   -
0.60 to 0.80 excl.
  ± 0.06   ± 0.06   ± 0.06   ± 0.07   ± 0.08
0.80 to 1.00 excl.
  ± 0.07   ± 0.07   ± 0.08   ± 0.09   ± 0.10
1.00 to 1.25 exc l.
   ± 0.08   ± 0.08   ± 0.09   ± 0.10   ± 0.12
1.25 to 1.60 excl.
  ± 0.09   ± 0.10   ± 0.11   ± 0.12   ± 0.14
1.60 to 2.00 excl.
  ± 0.10   ± 0.11   ± 0.12   ± 0.14   ± 0.16
 
 
BS 1449 Part 1 Carbon Steel Plates, Sheet & Strip
 
 
Chemical composition Grade Chemical Composition, % Max. Classification
- C Mn P S -
CR 4 0.12 0.60 0.050 0.050 Drawing Quality
CR 3 0.10 0.50 0.040 0.040 Deep Drawing Quality
CR 2 0.08 0.45 0.030 0.035 Extra Deep Drawing Quality
CR 1 0.08 0.45 0.025 0.030 -
 
 
Mechanical Properties
 
 
Grade Yield Strength Tensile Strength Original Gauge Length Lo Bend mandrel Diameter
  N/mm²min. N/mm²min 50 mm 80mm 200mm 180º bend)
CR4 (140) (280) - - - CONTACT
CR 3 (140) (280) (34) (32) (25) CONTACT
CR 2 140 280 36 (34) 27 CONTACT
CR 1 140 280 38 (36) 29 CONTACT
 
  Note:
1. Tensile Properties given in brackets are for guidance only and are not mandatory unless specially agreed at the  time of ordering. Tensile test result is not normally requested for grade CR 3 and
2. For material less then 1.00 mm thick, the percentage elongation is reduced by 1 for each 0.25mm reduction in  thickness.
3  In case of this specification the agreement between the manufacturer and the customer is prior to ordering .
4. *t- thickness of material 		 
 
DIN 1623 Part 1 Cold Rolled Sheet and Strips for Cold Forming
 
 
  Chemical Composition, % Max. Mechanical Properties   Hardness,
Max .
Steel* Grade % C %P %S Tensile Strength N/MM² Yield Strength N/MM², max Elongation %, min HRB HR30T
St12 0.10 - - 270~410 280 28 65 60
St13 0.10 - - 270~370 240 34 55 53
St14 0.08 - - 270~350 210 38 50 50
 
 
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